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[Solved] How to show Qt debug messages outside the debugger

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  • Q Offline
    Q Offline
    qtrahul
    wrote on last edited by
    #4

    What actually want to do.
    Do you want to transfer those msgs outside that console debugger ?

    Suppose ,I am using Qt creator, then the msgs which are created only in the debug environment, I have not seen it.

    Because user does not have the access to the debug handling property.

    regards,

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    • K Offline
      K Offline
      kamalakshantv
      wrote on last edited by
      #5

      Make changes to your .pro file as bradley has mentioned.

      Also you can explore more options

      @CONFIG += qt warn_on release rtti exceptions @

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      • D Offline
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        d.oberkofler
        wrote on last edited by
        #6

        [quote author="Bradley" date="1293091435"]Add this to your qmake .pro file
        @
        CONFIG += console
        @
        [/quote]

        I've just tried to add this CONFIG option to a sample project but cannot see any changes under OSX. I've added a simple
        @
        qDebug() << "test";
        @
        that is shown in the debugger and QtCreator but cannot be seen when running my sample using open from by shell.

        Could you please give me some more information on:

        • What this configuration is supposed to do and/or where to find the documentation?
        • To what this option in qmake translates in a simple makefile?

        Thank you!

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        • D Offline
          D Offline
          d.oberkofler
          wrote on last edited by
          #7

          [quote author="qtrahul" date="1293091619"]What actually want to do.
          Do you want to transfer those msgs outside that console debugger ?

          Suppose ,I am using Qt creator, then the msgs which are created only in the debug environment, I have not seen it.

          Because user does not have the access to the debug handling property.

          regards,[/quote]

          What I'm actually investigating is how to make this (debug output) information available to others then the actual developer. In my case this would typically be someone from Q&A doing alpha and beta tests or end users doing beta testing using debug builds.

          The debug messages are often extremely useful to track down problems while testing and it would somehow be nice to have a little window aside of the actual application that shows the debug messages as they show up. This can for sure be implemented individually using a customized logging but I was just wondering what the "standard" functionality of the Qt Framework offers.

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          • K Offline
            K Offline
            kamalakshantv
            wrote on last edited by
            #8

            Seems in that case you will have to log it to a file.

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            • G Offline
              G Offline
              giesbert
              wrote on last edited by
              #9

              You can install message handlers in Qt, to catch the debug messages and do with them, what you need. I know, there is a possibility, but I'm not 100% sure, how.

              Nokia Certified Qt Specialist.
              Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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              • G Offline
                G Offline
                giesbert
                wrote on last edited by
                #10

                I looked a bit for information about this topic:
                "Here som general things about debugging (also to Mac)":http://doc.qt.nokia.com/4.7/debug.html

                bq. The Qt implementation of these functions prints the text to the stderr output under Unix/X11 and Mac OS X. With Windows, if it is a console application, the text is sent to console; otherwise, it is sent to the debugger. You can take over these functions by installing a message handler using qInstallMsgHandler().

                So it also shows a way you can go to use "custom message handlers":http://doc.qt.nokia.com/4.7/qtglobal.html#qInstallMsgHandler

                Nokia Certified Qt Specialist.
                Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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                • G Offline
                  G Offline
                  goetz
                  wrote on last edited by
                  #11

                  On Mac OS X the debug output goes to the system logger. You can read it with the Console Application (Usually in /Applications/Utilities/Console.app).

                  For your own logging facilities "qInstallMsgHandler()":http://doc.qt.nokia.com/latest/qtglobal.html#qInstallMsgHandler is your friend (that's the solution Gerolf mentioned).

                  I once wrote a small GUI that collects the qXXX() messages. I can put it in the wiki on request.

                  http://www.catb.org/~esr/faqs/smart-questions.html

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                  • K Offline
                    K Offline
                    kamalakshantv
                    wrote on last edited by
                    #12

                    You can get some help using qInstallMsgHandler() from "this":http://lists.trolltech.com/qt-interest/2006-05/msg00602.html thread too.

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                    • A Offline
                      A Offline
                      andre
                      wrote on last edited by
                      #13

                      QxtLogger can install itself the hander for Qt's debug messages as well, and you can use several outputs for your logging info. StdErr/StdOut of course, but also files in different formats.

                      The qt += console suggestion given earlier only works on windows.

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                      • D Offline
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                        d.oberkofler
                        wrote on last edited by
                        #14

                        [quote author="Volker" date="1293097794"]On Mac OS X the debug output goes to the system logger. You can read it with the Console Application (Usually in /Applications/Utilities/Console.app).

                        For your own logging facilities "qInstallMsgHandler()":http://doc.qt.nokia.com/latest/qtglobal.html#qInstallMsgHandler is your friend (that's the solution Gerolf mentioned).

                        I once wrote a small GUI that collects the qXXX() messages. I can put it in the wiki on request.[/quote]

                        I think it would be great if you could make your "small GUI that collects the qXXX() messages" available to everyone.

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                        • V Offline
                          V Offline
                          vcsala
                          wrote on last edited by
                          #15

                          @Volker, that would be really nice of you.

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                          • K Offline
                            K Offline
                            kamalakshantv
                            wrote on last edited by
                            #16

                            [quote author="Volker" date="1293097794"]On Mac OS X the debug output goes to the system logger. You can read it with the Console Application (Usually in /Applications/Utilities/Console.app).

                            For your own logging facilities "qInstallMsgHandler()":http://doc.qt.nokia.com/latest/qtglobal.html#qInstallMsgHandler is your friend (that's the solution Gerolf mentioned).

                            I once wrote a small GUI that collects the qXXX() messages. I can put it in the wiki on request.[/quote]

                            Yes, everyone would like such a handy tool.

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                            • G Offline
                              G Offline
                              giesbert
                              wrote on last edited by
                              #17

                              Request :-))

                              Nokia Certified Qt Specialist.
                              Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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                              • G Offline
                                G Offline
                                goetz
                                wrote on last edited by
                                #18

                                I've added a "wiki page":http://developer.qt.nokia.com/wiki/Browser_for_QDebug_output with the source code of the QDebug Log Output Browser.

                                I hope it is useful for somebody and of course feel free to ask, if you have questions.

                                http://www.catb.org/~esr/faqs/smart-questions.html

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                                • A Offline
                                  A Offline
                                  ashwindas
                                  wrote on last edited by
                                  #19

                                  Thanks Volker, I was also looking for something similar :)

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                                  • U Offline
                                    U Offline
                                    ucomesdag
                                    wrote on last edited by
                                    #20

                                    [quote author="Volker" date="1294011522"]I've added a "wiki page":http://developer.qt.nokia.com/wiki/Browser_for_QDebug_output with the source code of the QDebug Log Output Browser.[/quote]

                                    Thanks Volker, fiddling with it at the moment... :-)

                                    Write “Qt”, not “QT” (QuickTime).

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                                    • G Offline
                                      G Offline
                                      goetz
                                      wrote on last edited by
                                      #21

                                      I added the .pro file, that was missing from the first version.

                                      http://www.catb.org/~esr/faqs/smart-questions.html

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                                      • D Offline
                                        D Offline
                                        d.oberkofler
                                        wrote on last edited by
                                        #22

                                        [quote author="Volker" date="1294011522"]I've added a "wiki page":http://developer.qt.nokia.com/wiki/Browser_for_QDebug_output with the source code of the QDebug Log Output Browser.
                                        I hope it is useful for somebody and of course feel free to ask, if you have questions.[/quote]
                                        Thank you!

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